improve porkbun credentials loading

internal/porkbun/client.go

@@ -0,0 +1,27 @@
+package porkbun
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+)
+
+const BaseURL = "https://api.porkbun.com/api/json/v3"
+
+type Client struct {
+	APIKey       string
+	SecretAPIKey string
+	HTTPClient   *http.Client
+}
+
+func New(apiKey, secretKey string) *Client {
+	return &Client{
+		APIKey:       apiKey,
+		SecretAPIKey: secretKey,
+		HTTPClient: &http.Client{
+			Timeout: 10 * time.Second,
+		},
+	}
+}